—How do you feel about your last trip?  

—_____. [ ]

A. I'd like to travel by train most  

B. I feel happy and relaxed

C. I'm going to spend two weeks in the mountains

D. Unluckily I lost my ticket and bag before I left

下面描述中，属于履带起重机特点的有( )。

A．机动性好

B．稳定性好

C．接地压强低

D．爬坡能力强

E．对地面破坏小